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Investment securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized cost |  |
Due in one year or less | $ 35,486 | $ 1,148
Due in one to five years | 24,278 | 11,553
Due in five to ten years | 40,038 | 18,287
Due in over ten years | 257,721 | 158,616
Amortized cost, total | 357,523 | 189,604
Amortized cost | 1,137,848 | 676,705
Fair value |  |
Due in one year or less | 35,662 | 1,152
Due in one to five years | 24,684 | 11,676
Due in five to ten years | 41,332 | 18,887
Due in over ten years | 275,798 | 165,990
Fair value, total | 377,476 | 197,705
Total debt securities | 1,172,400 | 688,381
Mortgage-backed securities - residential |  |
Amortized cost |  |
Mortgage-backed securities | 760,099 | 474,144
Amortized cost | 760,099 | 474,144
Fair value |  |
Mortgage-backed securities | 773,336 | 477,312
Total debt securities | 773,336 | 477,312
Mortgage-backed securities - commercial |  |
Amortized cost |  |
Mortgage-backed securities | 20,226 | 12,957
Amortized cost | 20,226 | 12,957
Fair value |  |
Mortgage-backed securities | 21,588 | 13,364
Total debt securities | $ 21,588 | $ 13,364

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 + Details
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